Added product() and product(for:) methods to Sequence

[MartonioJunior]

🚀

Added product() and product(for:) methods for multiplying elements and properties in a sequence (standalone PR as requested on #1167).

Checklist

• I checked the Contributing Guidelines before creating this request.
• New extensions are written in Swift 5.6.
• New extensions support iOS 12.0+ / tvOS 12.0+ / macOS 10.13+ / watchOS 4.0+, or use @available if not.
• I have added tests for new extensions, and they passed.
• All extensions have a clear comments explaining their functionality, all parameters and return type in English.
• All extensions are declared as public.
• I have added a changelog entry describing my changes.

[LucianoPAlmeida]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a8aee67) 95.89% compared to head (600a7a4) 95.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1168   +/-   ##
=======================================
  Coverage   95.89%   95.89%           
=======================================
  Files         107      107           
  Lines        3966     3969    +3     
=======================================
+ Hits         3803     3806    +3     
  Misses        163      163           

Flag	Coverage Δ
ios	95.40% <100.00%> (+<0.01%)	⬆️
macos	96.53% <100.00%> (+<0.01%)	⬆️
tvos	94.23% <100.00%> (+<0.01%)	⬆️

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